drivers/ata/mtk_ahci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * MTK SATA platform driver
   4  *
   5  * Copyright (C) 2020 MediaTek Inc.
   6  *
   7  * Author: Ryder Lee <ryder.lee@mediatek.com>
   8  * Author: Frank Wunderlich <frank-w@public-files.de>
   9  */
  10
  11 #include <common.h>
  12 #include <ahci.h>
  13 #include <asm/io.h>
  14 #include <dm.h>
  15 #include <dm/of_access.h>
  16 #include <generic-phy.h>
  17 #include <linux/err.h>
  18 #include <regmap.h>
  19 #include <reset.h>
  20 #include <sata.h>
  21 #include <scsi.h>
  22 #include <syscon.h>
  23
  24 #define SYS_CFG                 0x14
  25 #define SYS_CFG_SATA_MSK        GENMASK(31, 30)
  26 #define SYS_CFG_SATA_EN         BIT(31)
  27
  28 struct mtk_ahci_priv {
  29         void *base;
  30
  31         struct ahci_uc_priv ahci_priv;
  32         struct regmap *mode;
  33         struct reset_ctl_bulk rst_bulk;
  34 };
  35
  36 static int mtk_ahci_bind(struct udevice *dev)
  37 {
  38         struct udevice *scsi_dev;
  39
  40         return ahci_bind_scsi(dev, &scsi_dev);
  41 }
  42
  43 static int mtk_ahci_of_to_plat(struct udevice *dev)
  44 {
  45         struct mtk_ahci_priv *priv = dev_get_priv(dev);
  46
  47         priv->base = devfdt_remap_addr_index(dev, 0);
  48
  49         return 0;
  50 }
  51
  52 static int mtk_ahci_parse_property(struct ahci_uc_priv *hpriv,
  53                                    struct udevice *dev)
  54 {
  55         struct mtk_ahci_priv *plat = dev_get_priv(dev);
  56         const void *fdt = gd->fdt_blob;
  57
  58         /* enable SATA function if needed */
  59         if (fdt_get_property(fdt, dev_of_offset(dev),
  60                              "mediatek,phy-mode", NULL)) {
  61                 plat->mode = syscon_regmap_lookup_by_phandle(dev,
  62                                                 "mediatek,phy-mode");
  63                 if (IS_ERR(plat->mode)) {
  64                         dev_err(dev, "missing phy-mode phandle\n");
  65                         return PTR_ERR(plat->mode);
  66                 }
  67                 regmap_update_bits(plat->mode, SYS_CFG,
  68                                    SYS_CFG_SATA_MSK, SYS_CFG_SATA_EN);
  69         }
  70
  71         ofnode_read_u32(dev_ofnode(dev), "ports-implemented",
  72                         &hpriv->port_map);
  73         return 0;
  74 }
  75
  76 static int mtk_ahci_probe(struct udevice *dev)
  77 {
  78         struct mtk_ahci_priv *priv = dev_get_priv(dev);
  79         int ret;
  80         struct phy phy;
  81
  82         ret = mtk_ahci_parse_property(&priv->ahci_priv, dev);
  83         if (ret)
  84                 return ret;
  85
  86         ret = reset_get_bulk(dev, &priv->rst_bulk);
  87         if (!ret) {
  88                 reset_assert_bulk(&priv->rst_bulk);
  89                 reset_deassert_bulk(&priv->rst_bulk);
  90         } else {
  91                 dev_err(dev, "Failed to get reset: %d\n", ret);
  92         }
  93
  94         ret = generic_phy_get_by_name(dev, "sata-phy", &phy);
  95         if (ret) {
  96                 pr_err("can't get the phy from DT\n");
  97                 return ret;
  98         }
  99
 100         ret = generic_phy_init(&phy);
 101         if (ret) {
 102                 pr_err("unable to initialize the sata phy\n");
 103                 return ret;
 104         }
 105
 106         ret = generic_phy_power_on(&phy);
 107         if (ret) {
 108                 pr_err("unable to power on the sata phy\n");
 109                 return ret;
 110         }
 111
 112         return ahci_probe_scsi(dev, (ulong)priv->base);
 113 }
 114
 115 static const struct udevice_id mtk_ahci_ids[] = {
 116         { .compatible = "mediatek,mtk-ahci" },
 117         { }
 118 };
 119
 120 U_BOOT_DRIVER(mtk_ahci) = {
 121         .name   = "mtk_ahci",
 122         .id     = UCLASS_AHCI,
 123         .of_match = mtk_ahci_ids,
 124         .bind   = mtk_ahci_bind,
 125         .of_to_plat = mtk_ahci_of_to_plat,
 126         .ops    = &scsi_ops,
 127         .probe  = mtk_ahci_probe,
 128         .priv_auto      = sizeof(struct mtk_ahci_priv),
 129 };